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<title xml:lang="en">Lateral transport of soil carbon and land−atmosphere CO
<sub>2</sub>
flux induced by water erosion in China</title>
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<name sortKey="Yue, Yao" sort="Yue, Yao" uniqKey="Yue Y" first="Yao" last="Yue">Yao Yue</name>
<affiliation>
<nlm:aff id="aff1">The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="aff2">School of Water Resources and Hydropower Engineering,
<institution>Wuhan University</institution>
, Wuhan 430072,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Ni, Jinren" sort="Ni, Jinren" uniqKey="Ni J" first="Jinren" last="Ni">Jinren Ni</name>
<affiliation>
<nlm:aff id="aff1">The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Ciais, Philippe" sort="Ciais, Philippe" uniqKey="Ciais P" first="Philippe" last="Ciais">Philippe Ciais</name>
<affiliation>
<nlm:aff id="aff3">Laboratoire des Sciences du Climat et de l’Environnement, Institut Pierre Simon Laplace, Commissariat à l'Énergie Atomique et aux Ènergies Alternatives, CNRS,
<institution>Université de Versailles Saint-Quentin-en-Yvelines</institution>
, 91191 Gif-sur-Yvette,
<country>France</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Piao, Shilong" sort="Piao, Shilong" uniqKey="Piao S" first="Shilong" last="Piao">Shilong Piao</name>
<affiliation>
<nlm:aff id="aff4">Department of Ecology,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="aff5">Key Laboratory of Alpine Ecology and Biodiversity,
<institution>Institute of Tibetan Plateau Research</institution>
, Chinese Academy of Sciences, Beijing 100101,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="aff6">CAS Center for Excellence in Tibetan Plateau Earth Sciences,
<institution>Chinese Academy of Sciences</institution>
, Beijing 100101,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Wang, Tao" sort="Wang, Tao" uniqKey="Wang T" first="Tao" last="Wang">Tao Wang</name>
<affiliation>
<nlm:aff id="aff5">Key Laboratory of Alpine Ecology and Biodiversity,
<institution>Institute of Tibetan Plateau Research</institution>
, Chinese Academy of Sciences, Beijing 100101,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="aff6">CAS Center for Excellence in Tibetan Plateau Earth Sciences,
<institution>Chinese Academy of Sciences</institution>
, Beijing 100101,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Huang, Mengtian" sort="Huang, Mengtian" uniqKey="Huang M" first="Mengtian" last="Huang">Mengtian Huang</name>
<affiliation>
<nlm:aff id="aff4">Department of Ecology,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Borthwick, Alistair G L" sort="Borthwick, Alistair G L" uniqKey="Borthwick A" first="Alistair G. L." last="Borthwick">Alistair G. L. Borthwick</name>
<affiliation>
<nlm:aff id="aff7">School of Engineering,
<institution>The University of Edinburgh</institution>
, Edinburgh EH9 3JL,
<country>United Kingdom</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Li, Tianhong" sort="Li, Tianhong" uniqKey="Li T" first="Tianhong" last="Li">Tianhong Li</name>
<affiliation>
<nlm:aff id="aff1">The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Wang, Yichu" sort="Wang, Yichu" uniqKey="Wang Y" first="Yichu" last="Wang">Yichu Wang</name>
<affiliation>
<nlm:aff id="aff1">The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Chappell, Adrian" sort="Chappell, Adrian" uniqKey="Chappell A" first="Adrian" last="Chappell">Adrian Chappell</name>
<affiliation>
<nlm:aff id="aff8">Land & Water,
<institution>Commonwealth Scientific and Industrial Research Organisation</institution>
, Canberra, ACT 2601,
<country>Australia</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Van Oost, Kristof" sort="Van Oost, Kristof" uniqKey="Van Oost K" first="Kristof" last="Van Oost">Kristof Van Oost</name>
<affiliation>
<nlm:aff id="aff9">Earth and Life Institute, Georges Lemaître Centre for Earth and Climate Research,
<institution>Université Catholique de Louvain</institution>
, B-1348 Louvain,
<country>Belgium</country>
</nlm:aff>
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<title xml:lang="en" level="a" type="main">Lateral transport of soil carbon and land−atmosphere CO
<sub>2</sub>
flux induced by water erosion in China</title>
<author>
<name sortKey="Yue, Yao" sort="Yue, Yao" uniqKey="Yue Y" first="Yao" last="Yue">Yao Yue</name>
<affiliation>
<nlm:aff id="aff1">The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="aff2">School of Water Resources and Hydropower Engineering,
<institution>Wuhan University</institution>
, Wuhan 430072,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Ni, Jinren" sort="Ni, Jinren" uniqKey="Ni J" first="Jinren" last="Ni">Jinren Ni</name>
<affiliation>
<nlm:aff id="aff1">The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Ciais, Philippe" sort="Ciais, Philippe" uniqKey="Ciais P" first="Philippe" last="Ciais">Philippe Ciais</name>
<affiliation>
<nlm:aff id="aff3">Laboratoire des Sciences du Climat et de l’Environnement, Institut Pierre Simon Laplace, Commissariat à l'Énergie Atomique et aux Ènergies Alternatives, CNRS,
<institution>Université de Versailles Saint-Quentin-en-Yvelines</institution>
, 91191 Gif-sur-Yvette,
<country>France</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Piao, Shilong" sort="Piao, Shilong" uniqKey="Piao S" first="Shilong" last="Piao">Shilong Piao</name>
<affiliation>
<nlm:aff id="aff4">Department of Ecology,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="aff5">Key Laboratory of Alpine Ecology and Biodiversity,
<institution>Institute of Tibetan Plateau Research</institution>
, Chinese Academy of Sciences, Beijing 100101,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="aff6">CAS Center for Excellence in Tibetan Plateau Earth Sciences,
<institution>Chinese Academy of Sciences</institution>
, Beijing 100101,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Wang, Tao" sort="Wang, Tao" uniqKey="Wang T" first="Tao" last="Wang">Tao Wang</name>
<affiliation>
<nlm:aff id="aff5">Key Laboratory of Alpine Ecology and Biodiversity,
<institution>Institute of Tibetan Plateau Research</institution>
, Chinese Academy of Sciences, Beijing 100101,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="aff6">CAS Center for Excellence in Tibetan Plateau Earth Sciences,
<institution>Chinese Academy of Sciences</institution>
, Beijing 100101,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Huang, Mengtian" sort="Huang, Mengtian" uniqKey="Huang M" first="Mengtian" last="Huang">Mengtian Huang</name>
<affiliation>
<nlm:aff id="aff4">Department of Ecology,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Borthwick, Alistair G L" sort="Borthwick, Alistair G L" uniqKey="Borthwick A" first="Alistair G. L." last="Borthwick">Alistair G. L. Borthwick</name>
<affiliation>
<nlm:aff id="aff7">School of Engineering,
<institution>The University of Edinburgh</institution>
, Edinburgh EH9 3JL,
<country>United Kingdom</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Li, Tianhong" sort="Li, Tianhong" uniqKey="Li T" first="Tianhong" last="Li">Tianhong Li</name>
<affiliation>
<nlm:aff id="aff1">The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Wang, Yichu" sort="Wang, Yichu" uniqKey="Wang Y" first="Yichu" last="Wang">Yichu Wang</name>
<affiliation>
<nlm:aff id="aff1">The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Chappell, Adrian" sort="Chappell, Adrian" uniqKey="Chappell A" first="Adrian" last="Chappell">Adrian Chappell</name>
<affiliation>
<nlm:aff id="aff8">Land & Water,
<institution>Commonwealth Scientific and Industrial Research Organisation</institution>
, Canberra, ACT 2601,
<country>Australia</country>
;</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Van Oost, Kristof" sort="Van Oost, Kristof" uniqKey="Van Oost K" first="Kristof" last="Van Oost">Kristof Van Oost</name>
<affiliation>
<nlm:aff id="aff9">Earth and Life Institute, Georges Lemaître Centre for Earth and Climate Research,
<institution>Université Catholique de Louvain</institution>
, B-1348 Louvain,
<country>Belgium</country>
</nlm:aff>
</affiliation>
</author>
</analytic>
<series>
<title level="j">Proceedings of the National Academy of Sciences of the United States of America</title>
<idno type="ISSN">0027-8424</idno>
<idno type="eISSN">1091-6490</idno>
<imprint>
<date when="2016">2016</date>
</imprint>
</series>
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<front>
<div type="abstract" xml:lang="en">
<title>Significance</title>
<p>The role of soil erosion as a net sink or source of atmospheric CO
<sub>2</sub>
remains highly debated. This work quantifies national-scale land−atmosphere CO
<sub>2</sub>
fluxes induced by soil erosion. Severe water erosion in China has caused displacement of 180 ± 80 Mt C⋅y
<sup>-1</sup>
of soil organic carbon during the last two decades, and the consequent land−atmosphere CO
<sub>2</sub>
flux from water erosion is a net CO
<sub>2</sub>
sink of 45 ± 25 Mt C⋅y
<sup>-1</sup>
, equivalent to 8–37% of the terrestrial carbon sink previously assessed in China. This closes an important gap concerning large-scale estimation of lateral and vertical CO
<sub>2</sub>
fluxes from water erosion and highlights the importance of reducing uncertainty in assessing terrestrial carbon balance.</p>
</div>
</front>
</TEI>
<pmc article-type="research-article">
<pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">Proc Natl Acad Sci U S A</journal-id>
<journal-id journal-id-type="iso-abbrev">Proc. Natl. Acad. Sci. U.S.A</journal-id>
<journal-id journal-id-type="hwp">pnas</journal-id>
<journal-id journal-id-type="pmc">pnas</journal-id>
<journal-id journal-id-type="publisher-id">PNAS</journal-id>
<journal-title-group>
<journal-title>Proceedings of the National Academy of Sciences of the United States of America</journal-title>
</journal-title-group>
<issn pub-type="ppub">0027-8424</issn>
<issn pub-type="epub">1091-6490</issn>
<publisher>
<publisher-name>National Academy of Sciences</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">27247397</article-id>
<article-id pub-id-type="pmc">4914144</article-id>
<article-id pub-id-type="publisher-id">201523358</article-id>
<article-id pub-id-type="doi">10.1073/pnas.1523358113</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Physical Sciences</subject>
<subj-group>
<subject>Earth, Atmospheric, and Planetary Sciences</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Lateral transport of soil carbon and land−atmosphere CO
<sub>2</sub>
flux induced by water erosion in China</article-title>
<alt-title alt-title-type="short">Lateral and vertical C fluxes induced by erosion</alt-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Yue</surname>
<given-names>Yao</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>a</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>b</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Ni</surname>
<given-names>Jinren</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>a</sup>
</xref>
<xref ref-type="corresp" rid="cor1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Ciais</surname>
<given-names>Philippe</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>c</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Piao</surname>
<given-names>Shilong</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>d</sup>
</xref>
<xref ref-type="aff" rid="aff5">
<sup>e</sup>
</xref>
<xref ref-type="aff" rid="aff6">
<sup>f</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Wang</surname>
<given-names>Tao</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>e</sup>
</xref>
<xref ref-type="aff" rid="aff6">
<sup>f</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Huang</surname>
<given-names>Mengtian</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>d</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Borthwick</surname>
<given-names>Alistair G. L.</given-names>
</name>
<xref ref-type="aff" rid="aff7">
<sup>g</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Li</surname>
<given-names>Tianhong</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>a</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Wang</surname>
<given-names>Yichu</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>a</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Chappell</surname>
<given-names>Adrian</given-names>
</name>
<xref ref-type="aff" rid="aff8">
<sup>h</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Van Oost</surname>
<given-names>Kristof</given-names>
</name>
<xref ref-type="aff" rid="aff9">
<sup>i</sup>
</xref>
</contrib>
<aff id="aff1">
<sup>a</sup>
The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</aff>
<aff id="aff2">
<sup>b</sup>
School of Water Resources and Hydropower Engineering,
<institution>Wuhan University</institution>
, Wuhan 430072,
<country>People’s Republic of China</country>
;</aff>
<aff id="aff3">
<sup>c</sup>
Laboratoire des Sciences du Climat et de l’Environnement, Institut Pierre Simon Laplace, Commissariat à l'Énergie Atomique et aux Ènergies Alternatives, CNRS,
<institution>Université de Versailles Saint-Quentin-en-Yvelines</institution>
, 91191 Gif-sur-Yvette,
<country>France</country>
;</aff>
<aff id="aff4">
<sup>d</sup>
Department of Ecology,
<institution>Peking University</institution>
, Beijing 100871,
<country>People’s Republic of China</country>
;</aff>
<aff id="aff5">
<sup>e</sup>
Key Laboratory of Alpine Ecology and Biodiversity,
<institution>Institute of Tibetan Plateau Research</institution>
, Chinese Academy of Sciences, Beijing 100101,
<country>People’s Republic of China</country>
;</aff>
<aff id="aff6">
<sup>f</sup>
CAS Center for Excellence in Tibetan Plateau Earth Sciences,
<institution>Chinese Academy of Sciences</institution>
, Beijing 100101,
<country>People’s Republic of China</country>
;</aff>
<aff id="aff7">
<sup>g</sup>
School of Engineering,
<institution>The University of Edinburgh</institution>
, Edinburgh EH9 3JL,
<country>United Kingdom</country>
;</aff>
<aff id="aff8">
<sup>h</sup>
Land & Water,
<institution>Commonwealth Scientific and Industrial Research Organisation</institution>
, Canberra, ACT 2601,
<country>Australia</country>
;</aff>
<aff id="aff9">
<sup>i</sup>
Earth and Life Institute, Georges Lemaître Centre for Earth and Climate Research,
<institution>Université Catholique de Louvain</institution>
, B-1348 Louvain,
<country>Belgium</country>
</aff>
</contrib-group>
<author-notes>
<corresp id="cor1">
<sup>1</sup>
To whom correspondence should be addressed. Email:
<email>nijinren@iee.pku.edu.cn</email>
.</corresp>
<fn fn-type="edited-by">
<p>Edited by Donald E. Canfield, Institute of Biology and Nordic Center for Earth Evolution, University of Southern Denmark, Odense, Denmark, and approved April 28, 2016 (received for review November 25, 2015)</p>
</fn>
<fn fn-type="con">
<p>Author contributions: J.N., P.C., S.P., and K.V.O. designed research; Y.Y. and J.N. performed research; J.N., P.C., and S.P. contributed new reagents/analytic tools; Y.Y., T.W., M.H., T.L., and Y.W. analyzed data; and Y.Y., J.N., P.C., S.P., A.G.L.B., Y.W., and A.C. wrote the paper.</p>
</fn>
</author-notes>
<pub-date pub-type="ppub">
<day>14</day>
<month>6</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>31</day>
<month>5</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="pmc-release">
<day>31</day>
<month>5</month>
<year>2016</year>
</pub-date>
<pmc-comment> PMC Release delay is 0 months and 0 days and was based on the . </pmc-comment>
<volume>113</volume>
<issue>24</issue>
<fpage>6617</fpage>
<lpage>6622</lpage>
<permissions>
<license license-type="open-access">
<license-p>Freely available online through the PNAS open access option.</license-p>
</license>
</permissions>
<self-uri xlink:title="pdf" xlink:href="pnas.201523358.pdf"></self-uri>
<abstract abstract-type="executive-summary">
<title>Significance</title>
<p>The role of soil erosion as a net sink or source of atmospheric CO
<sub>2</sub>
remains highly debated. This work quantifies national-scale land−atmosphere CO
<sub>2</sub>
fluxes induced by soil erosion. Severe water erosion in China has caused displacement of 180 ± 80 Mt C⋅y
<sup>-1</sup>
of soil organic carbon during the last two decades, and the consequent land−atmosphere CO
<sub>2</sub>
flux from water erosion is a net CO
<sub>2</sub>
sink of 45 ± 25 Mt C⋅y
<sup>-1</sup>
, equivalent to 8–37% of the terrestrial carbon sink previously assessed in China. This closes an important gap concerning large-scale estimation of lateral and vertical CO
<sub>2</sub>
fluxes from water erosion and highlights the importance of reducing uncertainty in assessing terrestrial carbon balance.</p>
</abstract>
<abstract>
<p>Soil erosion by water impacts soil organic carbon stocks and alters CO
<sub>2</sub>
fluxes exchanged with the atmosphere. The role of erosion as a net sink or source of atmospheric CO
<sub>2</sub>
remains highly debated, and little information is available at scales larger than small catchments or regions. This study attempts to quantify the lateral transport of soil carbon and consequent land−atmosphere CO
<sub>2</sub>
fluxes at the scale of China, where severe erosion has occurred for several decades. Based on the distribution of soil erosion rates derived from detailed national surveys and soil carbon inventories, here we show that water erosion in China displaced 180 ± 80 Mt C⋅y
<sup>−1</sup>
of soil organic carbon during the last two decades, and this resulted a net land sink for atmospheric CO
<sub>2</sub>
of 45 ± 25 Mt C⋅y
<sup>−1</sup>
, equivalent to 8–37% of the terrestrial carbon sink previously assessed in China. Interestingly, the “hotspots,” largely distributed in mountainous regions in the most intensive sink areas (>40 g C⋅m
<sup>−2</sup>
⋅y
<sup>−1</sup>
), occupy only 1.5% of the total area suffering water erosion, but contribute 19.3% to the national erosion-induced CO
<sub>2</sub>
sink. The erosion-induced CO
<sub>2</sub>
sink underwent a remarkable reduction of about 16% from the middle 1990s to the early 2010s, due to diminishing erosion after the implementation of large-scale soil conservation programs. These findings demonstrate the necessity of including erosion-induced CO
<sub>2</sub>
in the terrestrial budget, hence reducing the level of uncertainty.</p>
</abstract>
<kwd-group>
<kwd>land−atmosphere CO
<sub>2</sub>
flux</kwd>
<kwd>soil carbon displacement</kwd>
<kwd>water erosion</kwd>
<kwd>national scale</kwd>
</kwd-group>
<counts>
<page-count count="6"></page-count>
</counts>
</article-meta>
</front>
</pmc>
</record>

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